Fig. 3From: Short-term exposure to PM2.5 and vanadium and changes in asthma gene DNA methylation and lung function decrements among urban childrenCorrelations between (a) PM2.5 and V measured at Time 1, and (b) repeated residential indoor measures of PM2.5, 4–8 years apart Of 139 children who had valid air pollution data at Time 1, 106 had previous residential indoor measurements that were collected 4–8 years ago using the same sampling methodologyBack to article page